I have a 13'' Macbook Air, 1.7 GHz i5, 4 GB 1333 MHz DDR3. its running Lion 10.7.4 I bought it in February, New. When i'm watching a video - eg, the E3 latest press conferences the fan noise gets ridiculous & i feel it getting very hot. This also happens when i plug in my thunderbolt-HDMI cable, when watching films through my TV, the mac heats up, fans kick in..loud. Surely it shouldnt get hot just watching a video? ..once i close the video it cools down again. should i take it back?